Source code for invenio_previewer.extensions.json_prismjs
# -*- coding: utf-8 -*-
#
# This file is part of Invenio.
# Copyright (C) 2016-2019 CERN.
#
# Invenio is free software; you can redistribute it and/or modify it
# under the terms of the MIT License; see LICENSE file for more details.
"""Previews a JSON file."""
from __future__ import absolute_import, print_function
import json
from collections import OrderedDict
from flask import current_app, render_template
from ..proxies import current_previewer
from ..utils import detect_encoding
previewable_extensions = ['json']
[docs]def render(file):
"""Pretty print the JSON file for rendering."""
with file.open() as fp:
encoding = detect_encoding(fp, default='utf-8')
file_content = fp.read().decode(encoding)
json_data = json.loads(file_content, object_pairs_hook=OrderedDict)
return json.dumps(json_data, indent=4, separators=(',', ': '))
[docs]def validate_json(file):
"""Validate a JSON file."""
max_file_size = current_app.config.get(
'PREVIEWER_MAX_FILE_SIZE_BYTES', 1 * 1024 * 1024)
if file.size > max_file_size:
return False
with file.open() as fp:
try:
json.loads(fp.read().decode('utf-8'))
return True
except:
return False
[docs]def can_preview(file):
"""Determine if the given file can be previewed."""
return (file.is_local() and
file.has_extensions('.json') and
validate_json(file))
[docs]def preview(file):
"""Render the appropriate template with embed flag."""
return render_template(
'invenio_previewer/json_prismjs.html',
file=file,
content=render(file),
js_bundles=current_previewer.js_bundles + ['prism_js.js'],
css_bundles=['prism_css.css']
)